大滞后过程对象自适应鲁棒PI控制器  

Robust adaptive PI controllers for large dead-time processes

作　　者：王亚刚[1] 许晓鸣[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《系统工程与电子技术》2009年第5期1184-1188,共5页Systems Engineering and Electronics

基　　金：上海市自然科学基金(08ZR1415500);上海市科委重点攻关计划项目(072305126);上海市教委科研创新项目(09YZ213)资助课题

摘　　要：针对较难控制的大滞后过程对象,提出了一种基于幅值裕度和相位裕度的自适应鲁棒PI控制器。该控制器利用闭环控制回路正常运行中产生的过程对象输入和输出信号,通过信号分解和傅立叶分析运算在线辨识过程对象在重要频率点上的频率响应特性,从而获得一个可以很好的描述大滞后对象的一阶加纯滞后模型。然后基于该模型计算出同时满足幅值裕度和相位裕度的鲁棒PI控制器参数,实现了大滞后过程对象的自适应鲁棒PI控制。提出的PI控制器的自适应过程不需要过程对象的任何先验知识,也不需要中断控制回路的正常运行。仿真实验表明了自适应鲁棒PI控制器的有效性和可行性。A new technique of adaptive PI controller with specifications on phase and amplitude margins for large dead-time processes is presented. On the basis of process input and output data of normal operation in the control loop, the important frequency responses of process are estimated with signal decomposition and Fourier analysis, and a first-order plus dead-time transform function is identified as well. Finally PI control parameters are calculated to satisfy both phase and amplitude margins. The adaptive procedure of PI controller does not need any prior knowledge of the process while the control loop is still in the normal operation. Simulation exam ples are given to show both effectiveness and feasibility of the adaptive PI controller for large dead time process.

关 键 词：系统辨识 鲁棒控制 频率响应 大滞后对象 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]